Reduction of ELM energy loss by pellet injection for ELM pacing

摘要: The energy loss caused by the edge-localized mode (ELM) needs to be reduced for ITER operations with ELMy H-mode plasmas. reduction in ELM pellet injection pacing is studied an integrated core/scrape-off layer/divertor transport code TOPICS-IB a magnetohydrodynamic stability and model taking account of E × B drift plasma cloud. It found that can significantly injected pedestal equivalent at middle timing natural cycle, whose pressure height only about 5% lower than onset. In this case, from low-field side enables small pellet, 1–2% particle content speed high enough approach top, reduce significantly. With above suitable conditions pacing, penetrates deep into triggers high-n ballooning modes localized eigenfunctions near where n toroidal number. Under conditions, successfully demonstrated simulations, which gas puff enhancement divertor pumping compensate core density increase due additional fuelling pellet.